HST to ACST converter

Hawaii Time (Honolulu) to Australian Central Time (Adelaide).

HST2:07 PMFri 30 Oct 2026

→

ACST10:37 AMSat 31 Oct 2026

ACST is 20 h 30 min ahead of HST.

Pick a time in HST

⇄ ACST to HST

9:00 AM HST = 5:30 AM ACST next day

Best time to meet

The best time to meet is between 1:00 PM and 5:00 PM HST, which is 9:30 AM to 1:30 PM ACST. Both sides are then inside 9 AM to 5 PM.

HST to ACST time table

For 30 Oct 2026. Green rows: both sides between 9 AM and 5 PM.

HST	ACST
12:00 AM HST	8:30 PM ACST
1:00 AM HST	9:30 PM ACST
2:00 AM HST	10:30 PM ACST
3:00 AM HST	11:30 PM ACST
4:00 AM HST	12:30 AM ACST next day
5:00 AM HST	1:30 AM ACST next day
6:00 AM HST	2:30 AM ACST next day
7:00 AM HST	3:30 AM ACST next day
8:00 AM HST	4:30 AM ACST next day
9:00 AM HST	5:30 AM ACST next day
10:00 AM HST	6:30 AM ACST next day
11:00 AM HST	7:30 AM ACST next day
12:00 PM HST	8:30 AM ACST next day
1:00 PM HST	9:30 AM ACST next day
2:00 PM HST	10:30 AM ACST next day
3:00 PM HST	11:30 AM ACST next day
4:00 PM HST	12:30 PM ACST next day
5:00 PM HST	1:30 PM ACST next day
6:00 PM HST	2:30 PM ACST next day
7:00 PM HST	3:30 PM ACST next day
8:00 PM HST	4:30 PM ACST next day
9:00 PM HST	5:30 PM ACST next day
10:00 PM HST	6:30 PM ACST next day
11:00 PM HST	7:30 PM ACST next day

Quick answers

9:00 AM HST = 5:30 AM ACST (next day)
12:00 PM HST = 8:30 AM ACST (next day)
3:00 PM HST = 11:30 AM ACST (next day)
5:00 PM HST = 1:30 PM ACST (next day)
9:00 AM ACST = 12:30 PM HST (previous day)
12:00 PM ACST = 3:30 PM HST (previous day)
5:00 PM ACST = 8:30 PM HST (previous day)

Does the gap change during the year?

Yes, because of daylight saving. Until 3 Apr 2027: ACST is 20 h 30 min ahead of HST. From 3 Apr 2027 to 2 Oct 2027: ACST is 19 h 30 min ahead of HST. From 2 Oct 2027 to 1 Apr 2028: ACST is 20 h 30 min ahead of HST.

HST does not change its clocks. ACST next changes its clocks on 4 Apr 2027 (back 1 h, to UTC+9:30), then on 3 Oct 2027 (forward 1 h, to UTC+10:30).

About HST and ACST

HST here means Hawaii Time, the clock in Honolulu. Right now it is UTC−10. It has no daylight saving.

ACST here means Australian Central Time, the clock in Adelaide. Right now it is UTC+10:30. Strictly, ACST is the winter name; in summer these places use ACDT. This page follows their real clock all year.

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